Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1ce038ec382edd…

MALICIOUS

PDF

98.0 KB Created: 2021-03-02 14:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4f2e2f13d01c3afc0e9ea803327406c SHA-1: 917a9ec248f987da0957067894df9f330e394c0e SHA-256: 6c1ce038ec382edd87705fcafeba9184a82a19faddc2a0080c80b55c88e401f2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/wix?keyword=cyberpunk+2020+motivation+tabletop+simulator PDF link annotation
    • https://cdn.sqhk.co/vinogusi/jygiHjj/82602404324.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/organizacion_administrativa_de_una_empresa_constructora.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/3rd_grade_workbooks_reading_comprehensionnsjqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_6019305988ccc.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/64237406818.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcef3d5e979a.pdfIn PDF document text
    • https://buzikapafopix.weebly.com/uploads/1/3/4/3/134375334/nirinalomafok-pigupilimevute.pdfIn PDF document text
    • https://gotugutulado.weebly.com/uploads/1/3/4/6/134648793/c835455.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/jgjfLPj/draw_line_in_table_word_2016.pdfIn PDF document text
    • http://xrootunited.com/zikodirezepbdyf.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/fLMhghc/photo_editor_online_free_jio_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vunonam.atwebpages.com/kegedozimizafumerurel.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/kolakutirapodebijovapofon.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/wigasumagamoxug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 5508 bytes
SHA-256: cc2731b434637f1d0cd872109d0417841e7b1bec22aaad776a51a752d7cffd98
font_01_sfnt_off00014868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14868 10516 bytes
SHA-256: ca4cc0e317505d1fcc7171e867feddb48c3e9462e614adef0b3615ed27ed9458
font_02_sfnt_off00016c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C6D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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